if ( document.images ) {
    mnu_pr_1_on = new Image(); mnu_pr_1_on.src="/common/images/mnu_pr_1_on.gif";
    mnu_pr_1_off = new Image(); mnu_pr_1_off.src="/common/images/mnu_pr_1_off.gif";
    mnu_pr_2_on = new Image(); mnu_pr_2_on.src="/common/images/mnu_pr_2_on.gif";
    mnu_pr_2_off = new Image(); mnu_pr_2_off.src="/common/images/mnu_pr_2_off.gif";
    mnu_pr_3_on = new Image(); mnu_pr_3_on.src="/common/images/mnu_pr_3_on.gif";
    mnu_pr_3_off = new Image(); mnu_pr_3_off.src="/common/images/mnu_pr_3_off.gif";
    mnu_pr_4_on = new Image(); mnu_pr_4_on.src="/common/images/mnu_pr_4_on.gif";
    mnu_pr_4_off = new Image(); mnu_pr_4_off.src="/common/images/mnu_pr_4_off.gif";
    mnu_pr_5_on = new Image(); mnu_pr_5_on.src="/common/images/mnu_pr_5_on.gif";
    mnu_pr_5_off = new Image(); mnu_pr_5_off.src="/common/images/mnu_pr_5_off.gif";
}